Garmin eTrex Owner's Manual - Page 40

Reference System Page The 'SYSTEM' Page shows you the software version, allowing you to update from Garmin's web site. A 'BATTERY LOW' message appears at the bottom of every page when there are approximately ten minutes of battery life left (when using alkaline batteries). 38 If 'Garmin DGPS' or 'RTCM/NMEA' format is selected, additional fields are provided to control a Garmin differential beacon receiver (e.g. GBR 21) directly from your eTrex. You can enter the beacon frequency and bit rate when you select 'User' from the Beacon pop-up list to manually tune the receiver (you can also 'scan' if you don't know what the nearby station is, but the unit could continue scanning if reception is temporarily lost). To select an I/O Format: 1. Press the PAGE Button and switch to the 'MENU' Page. Use the UP and DOWN Button and highlight the 'SETUP' field. Press ENTER. The 'SETUP' Page appears. 2. Press the UP or DOWN Button and select the 'INTERFACE' field. Press ENTER. The 'INTERFACE' Page appears. 3. Press ENTER on the 'I/O FORMAT' field. Press the UP or DOWN Button to select the desired format. Press ENTER. Press PAGE to return to the page of your choice. System Page The System Page shows you the eTrex's current software version and allows you to choose from three modes of operation: • Normal • Battery Save • Demo (Demonstration) Normal Mode The GPS receiver is turned on all the time when it's in 'NORMAL' mode. The normal mode is more sensitive to sudden turns or change of speed/acceleration.